Question

find the circumference of the circles whose diameter is 42 cm​

Answer 1

Answer:

Diameter = 42cm

2r = 42 cm

r = 21cm

Circumference of circle = 2 × pie × r

=> 2 × 21 × 22/7

=> 2 × 3 × 22

=> 132cm

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Answer 2

Answer:

r=42/2=21

2×22/7×21

2×22×3

6×22

132